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https://github.com/retspen/webvirtcloud
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external snapshot implementation
This commit is contained in:
cserma
catborise
parent
ad9f1db643
commit
fd6b2ec4bf
4 changed files with 315 additions and 7 deletions
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@ -2,6 +2,7 @@ import contextlib
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import json
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import os.path
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import time
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import subprocess
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try:
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from libvirt import (
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@ -18,6 +19,10 @@ try:
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VIR_MIGRATE_POSTCOPY,
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VIR_MIGRATE_UNDEFINE_SOURCE,
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VIR_MIGRATE_UNSAFE,
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VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY,
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VIR_DOMAIN_SNAPSHOT_DELETE_METADATA_ONLY,
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VIR_DOMAIN_SNAPSHOT_LIST_INTERNAL,
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VIR_DOMAIN_SNAPSHOT_LIST_EXTERNAL,
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libvirtError,
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)
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from libvirt_qemu import VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT, qemuAgentCommand
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@ -34,7 +39,6 @@ from vrtManager import util
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from vrtManager.connection import wvmConnect
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from vrtManager.storage import wvmStorage, wvmStorages
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class wvmInstances(wvmConnect):
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def get_instance_status(self, name):
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inst = self.get_instance(name)
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@ -1283,9 +1287,152 @@ class wvmInstance(wvmConnect):
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)
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self._defineXML(xml_temp)
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def get_snapshot(self):
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def create_external_snapshot(self, name, instance, date=None, desc=None):
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if self.instance.isActive() == False:
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result = self.instance.create()
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if result < 0:
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return 0
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creation_time = time.time()
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state = "shutoff" if self.get_status() == 5 else "running"
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xml = """<domainsnapshot>
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<name>%s</name>
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<description>%s</description>
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<state>%s</state>
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<creationTime>%d</creationTime>""" % (
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name,
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desc,
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state,
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creation_time,
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)
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self.change_snapshot_xml()
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xml += self._XMLDesc(VIR_DOMAIN_XML_SECURE)
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xml += """<active>0</active>
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</domainsnapshot>"""
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#
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# flag number for libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY
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# is 16 (0x10; 1 << 4)
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#
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self._snapshotCreateXML(xml, VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY)
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tree = ElementTree.fromstring(self._XMLDesc(0))
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for disks in tree.findall("devices/disk"):
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if disks.get('device') == "disk":
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backingStore = disks.find("backingStore")
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if backingStore is not None:
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temp_backing_file = backingStore.find('source').get('file')
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vol_base = self.get_volume_by_path(temp_backing_file)
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pool = vol_base.storagePoolLookupByVolume()
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pool.refresh(0)
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def get_external_snapshots(self):
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external_snapshots = []
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temp_snapshots = self.get_snapshot(VIR_DOMAIN_SNAPSHOT_LIST_EXTERNAL)
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for temp_snapshot in temp_snapshots:
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external_snapshot = []
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external_snapshot.append(temp_snapshot['name'])
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external_snapshot.append(temp_snapshot['date'])
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external_snapshot.append(temp_snapshot['description'])
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external_snapshots.append(external_snapshot)
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return external_snapshots
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def delete_external_snapshot(self, name, instance):
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base_xml = ElementTree.fromstring(self._XMLDesc(0))
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for disk in base_xml.findall('devices/disk'):
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if disk.get('device') == 'disk':
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backingStore = disk.find('backingStore')
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if backingStore is not None:
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if backingStore.find('source') is not None:
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target_dev = disk.find('target').get('dev')
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backing_file = backingStore.find('source').get('file')
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source_file = disk.find('source').get('file')
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self.instance.blockCommit(target_dev, backing_file, source_file, flags=4|2)
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while True:
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info = self.instance.blockJobInfo(target_dev, 0)
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if info.get('cur') == info.get('end'):
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self.instance.blockJobAbort(target_dev,flags=2)
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break
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snap = self.instance.snapshotLookupByName(name, 0)
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snapXML = ElementTree.fromstring(snap.getXMLDesc(0))
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disks = []
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for disk_backup in snapXML.findall('inactiveDomain/devices/disk'):
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if disk_backup.get('device') == 'disk':
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disk_dict = {}
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if disk_backup.find('source') is not None:
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disk_dict['backing_file'] = disk_backup.find('source').get('file')
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if disk_backup.find('driver') is not None:
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disk_dict['driver_name'] = disk_backup.find('driver').get('name')
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disk_dict['driver_type'] = disk_backup.find('driver').get('type')
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if disk_backup.find('target') is not None:
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disk_dict['target_dev'] = disk_backup.find('target').get('dev')
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disk_dict['target_bus'] = disk_backup.find('target').get('bus')
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if disk_backup.find('boot') is not None:
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disk_dict['boot_order'] = disk_backup.find('boot').get('order')
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disks.append(disk_dict)
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for disk in disks:
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self.instance.updateDeviceFlags("""<disk type='file' device='disk'>
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<driver name='{}' type='{}'/>
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<source file='{}'/>
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<target dev='{}' bus='{}'/>
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<boot order='{}'/>
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</disk>""".format(disk["driver_name"],disk["driver_type"],disk["backing_file"],disk["target_dev"],disk["target_bus"],disk["boot_order"]))
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snap = self.instance.snapshotLookupByName(name, 0)
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# flag number for delete snapshot metadata only
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# is 2 (0x2; 1 << 1)
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snap.delete(VIR_DOMAIN_SNAPSHOT_DELETE_METADATA_ONLY)
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def revert_external_snapshot(self, name, instance, date, desc):
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snap = self.instance.snapshotLookupByName(name, 0)
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snapXML = ElementTree.fromstring(snap.getXMLDesc(0))
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disks = []
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for disk_backup in snapXML.findall('inactiveDomain/devices/disk'):
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if disk_backup.get('device') == 'disk':
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disk_dict = {}
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if disk_backup.find('source') is not None:
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disk_dict['backing_file'] = disk_backup.find('source').get('file')
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if disk_backup.find('driver') is not None:
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disk_dict['driver_name'] = disk_backup.find('driver').get('name')
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disk_dict['driver_type'] = disk_backup.find('driver').get('type')
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if disk_backup.find('target') is not None:
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disk_dict['target_dev'] = disk_backup.find('target').get('dev')
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disk_dict['target_bus'] = disk_backup.find('target').get('bus')
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if disk_backup.find('boot') is not None:
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disk_dict['boot_order'] = disk_backup.find('boot').get('order')
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disks.append(disk_dict)
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# flag number for delete snapshot metadata only
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# is 2 (0x2; 1 << 1)
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snap.delete(VIR_DOMAIN_SNAPSHOT_DELETE_METADATA_ONLY)
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base_xml = ElementTree.fromstring(self._XMLDesc(0))
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for disk in base_xml.findall('devices/disk'):
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if disk.get('device') == 'disk':
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backingStore = disk.find('backingStore')
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if backingStore is not None:
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if backingStore.find('source') is not None:
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vol_base = self.get_volume_by_path(backingStore.find('source').get('file'))
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pool = vol_base.storagePoolLookupByVolume()
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pool.refresh(0)
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vol_snap = self.get_volume_by_path(disk.find('source').get('file'))
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vol_snap.wipe(0)
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vol_snap.delete(0)
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for disk in disks:
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self.instance.updateDeviceFlags("""<disk type='file' device='disk'>
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<driver name='{}' type='{}'/>
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<source file='{}'/>
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<target dev='{}' bus='{}'/>
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<boot order='{}'/>
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</disk>""".format(disk["driver_name"],disk["driver_type"],disk["backing_file"],disk["target_dev"],disk["target_bus"],disk["boot_order"]))
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self.create_external_snapshot(name, instance, date, desc)
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def get_snapshot(self, flag=VIR_DOMAIN_SNAPSHOT_LIST_INTERNAL):
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snapshots = []
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snapshot_list = self.instance.snapshotListNames(0)
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snapshot_list = self.instance.snapshotListNames(flag)
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for snapshot in snapshot_list:
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snap = self.instance.snapshotLookupByName(snapshot, 0)
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snap_description = util.get_xml_path(
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